6.14-stable review patch. If anyone has any objections, please let me know.
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From: Tiezhu Yang yangtiezhu@loongson.cn
[ Upstream commit ab6ce22b789622ca732e91cbb3a5cb5ba370cbd0 ]
In the relocation section ".rela.rodata" of each .o file compiled with LoongArch toolchain, there are various symbol types such as STT_NOTYPE, STT_OBJECT, STT_FUNC in addition to the usual STT_SECTION, it needs to use reloc symbol offset instead of reloc addend to find the destination instruction in find_jump_table() and add_jump_table().
For the most part, an absolute relocation type is used for rodata. In the case of STT_SECTION, reloc->sym->offset is always zero, and for the other symbol types, reloc_addend(reloc) is always zero, thus it can use a simple statement "reloc->sym->offset + reloc_addend(reloc)" to obtain the symbol offset for various symbol types.
Signed-off-by: Tiezhu Yang yangtiezhu@loongson.cn Link: https://lore.kernel.org/r/20250211115016.26913-2-yangtiezhu@loongson.cn Acked-by: Huacai Chen chenhuacai@loongson.cn Signed-off-by: Josh Poimboeuf jpoimboe@kernel.org Stable-dep-of: ef753d66051c ("objtool: Fix detection of consecutive jump tables on Clang 20") Signed-off-by: Sasha Levin sashal@kernel.org --- tools/objtool/check.c | 16 +++++++++++----- 1 file changed, 11 insertions(+), 5 deletions(-)
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index c1fa0220f33de..79c49c75b429b 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -1954,6 +1954,7 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn, unsigned int prev_offset = 0; struct reloc *reloc = table; struct alternative *alt; + unsigned long sym_offset;
/* * Each @reloc is a switch table relocation which points to the target @@ -1971,9 +1972,10 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn, if (prev_offset && reloc_offset(reloc) != prev_offset + 8) break;
+ sym_offset = reloc->sym->offset + reloc_addend(reloc); + /* Detect function pointers from contiguous objects: */ - if (reloc->sym->sec == pfunc->sec && - reloc_addend(reloc) == pfunc->offset) + if (reloc->sym->sec == pfunc->sec && sym_offset == pfunc->offset) break;
/* @@ -1981,10 +1983,10 @@ static int add_jump_table(struct objtool_file *file, struct instruction *insn, * which point to the end of the function. Ignore them. */ if (reloc->sym->sec == pfunc->sec && - reloc_addend(reloc) == pfunc->offset + pfunc->len) + sym_offset == pfunc->offset + pfunc->len) goto next;
- dest_insn = find_insn(file, reloc->sym->sec, reloc_addend(reloc)); + dest_insn = find_insn(file, reloc->sym->sec, sym_offset); if (!dest_insn) break;
@@ -2023,6 +2025,7 @@ static void find_jump_table(struct objtool_file *file, struct symbol *func, struct reloc *table_reloc; struct instruction *dest_insn, *orig_insn = insn; unsigned long table_size; + unsigned long sym_offset;
/* * Backward search using the @first_jump_src links, these help avoid @@ -2046,7 +2049,10 @@ static void find_jump_table(struct objtool_file *file, struct symbol *func, table_reloc = arch_find_switch_table(file, insn, &table_size); if (!table_reloc) continue; - dest_insn = find_insn(file, table_reloc->sym->sec, reloc_addend(table_reloc)); + + sym_offset = table_reloc->sym->offset + reloc_addend(table_reloc); + + dest_insn = find_insn(file, table_reloc->sym->sec, sym_offset); if (!dest_insn || !insn_func(dest_insn) || insn_func(dest_insn)->pfunc != func) continue;